Have the format default to YouTube iTag 18

For full list of formats - look at: 
http://en.wikipedia.org/wiki/YouTube#Quality_and_codecs
This is just an initial change
On Debian nokogiri needs to be lowercase
Make bash script
Script now retries to download until games found
Remove print document
encourage Nokogiri to use UTF-8 format
Add ability to download only N games
Download hi-res format